java中简易计算器代码 java做个计算器代码

java编一个计算器的代码

界面漂亮堪比系统自带计算器，功能完美加减乘除开平方等等全部具备，还有清零按钮，小数点的使用，连加连乘功能完全参考系统官方计算器经过长期调试改进而成，马上拷贝代码拿去试试看吧，绝不后悔！

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代码如下：

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import java.util.*;

public class Counter {

public static void main(String[] args) {

CounterFrame frame = new CounterFrame();

frame.show();

}

}

class CounterFrame extends JFrame {

public CounterFrame() {

JMenuBar menuBar = new JMenuBar();

JMenu menuFile = new JMenu();

JMenu menuFile1 = new JMenu();

JMenu menuFile2 = new JMenu();

JMenu menuFile3 = new JMenu();

JMenuItem menuFileExit = new JMenuItem();

menuFile.setText("文件");

menuFile1.setText("编辑");

menuFile2.setText("查看");

menuFile3.setText("帮助");

menuFileExit.setText("退出");

menuFileExit.addActionListener

(

new ActionListener() {

public void actionPerformed(ActionEvent e) {

CounterFrame.this.windowClosed();

}

}

);

menuFile.add(menuFileExit);

menuBar.add(menuFile);

menuBar.add(menuFile1);

menuBar.add(menuFile2);

menuBar.add(menuFile3);

setTitle("计算器");

setJMenuBar(menuBar);

setSize(new Dimension(400, 280));

this.getContentPane().add(new Allpanel());

this.addWindowListener

(

new WindowAdapter() {

public void windowClosing(WindowEvent e) {

CounterFrame.this.windowClosed();

}

}

);

}

protected void windowClosed() {

System.exit(0);

}

}

class Tool {

public static Tool instance;

private JTextField field;

private Tool() {

this.field=new JTextField(30);

this.field.setHorizontalAlignment(JTextField.RIGHT);

}

public static Tool getinstance()

{

if(instance==null)

{

instance=new Tool();

}

return instance;

}

public JTextField getfield()

{

return (this.field);

}

}

class Allpanel extends JPanel {

public Allpanel() {

this.setLayout(new BorderLayout(0,7));

Northpanel np=new Northpanel();

Centerpanel cp=new Centerpanel();

this.add(np,BorderLayout.NORTH);

this.add(cp,BorderLayout.CENTER);

}

}

class Centercenter extends JPanel {

static Vector Vec=new Vector();

static Vector vc=new Vector();

static Vector vc1=new Vector();

static Vector vc2=new Vector();

static Vector vc3=new Vector();

static String begin="yes";

static double add;

static double jq;

static double cs;

static double cq;

static double dy;

static String jg;

static String what;

static double tool=0;

static String to="yes";

/**

* Method Centercenter

*

*

*/

public Centercenter() {

// TODO: Add your code here

final JTextField text=Tool.getinstance().getfield();

this.setLayout(new GridLayout(4,5,3,3));

String arg[] ={"7","8","9","/","sqrt","4","5","6","*","%","1","2","3","-","1/x","0","+/-",".","+","="};

for(int i=0;i20;i++)

{

final JButton b=new JButton(arg[i]);

//this.add(new JButton(arg[i]));

this.add(b);

if(i==0||i==1||i==2||i==5||i==6||i==7||i==10||i==11||i==12||i==15)

{

b.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

String mark=b.getText();

String ma=text.getText();

if(vc3.contains("v3"))

{

text.setText("0."+mark);

vc3.clear();

}

else if(vc.contains("a"))

{

if(vc2.contains("v2"))

{

text.setText("0."+mark);

vc.clear();

vc2.clear();

}

else

{

text.setText(mark);

vc.clear();

Vec.clear();

Vec.add(mark);

}

}

else

{

text.setText(ma.trim()+mark);

Vec.add(mark);

}

begin="no";

to="yes";

}

});

}

if(i==17)

{

b.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

String mar=b.getText();

String m=text.getText();

if("yes".equals(begin))

{

vc3.add("v3");

}

if(vc1.contains("v1"))

{

vc2.add("v2");

vc1.clear();

}

if(!Vec.contains(".")!vc.contains("a"))

{

text.setText(m.trim()+mar);

Vec.add(".");

}

}

});

}

if(i==18)

{

b.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

String ma=text.getText();

add=Double.parseDouble(ma);

if(what==null)

{

tool=add;

what="add";

}

else

{

tool=tool+add;

text.setText(String.valueOf((tool)));

}

vc.add("a");

vc1.add("v1");

to="+";

}

});

}

if(i==13)

{

b.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

String ma=text.getText();

jq=Double.parseDouble(ma);

if(what==null)

{

tool=jq;

what="jq";

}

else

{

tool=tool-jq;

text.setText(String.valueOf((tool)));

}

vc.add("a");

vc1.add("v1");

to="-";

}

});

}

if(i==3)

{

b.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

String ma=text.getText();

cq=Double.parseDouble(ma);

if(what==null)

{

tool=cq;

what="cq";

}

else

{

tool=tool/cq;

text.setText(String.valueOf((tool)));

}

vc.add("a");

vc1.add("v1");

to="/";

}

});

}

if(i==4)

{

b.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

String ma=text.getText();

cq=Double.parseDouble(ma);

text.setText(String.valueOf(Math.sqrt(cq)));

}

});

}

if(i==8)

{

b.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

String ma=text.getText();

cs=Double.parseDouble(ma);

if(what==null)

{

tool=cs;

what="cs";

}

else

{

tool=tool*cs;

text.setText(String.valueOf((tool)));

}

vc.add("a");

vc1.add("v1");

to="*";

}

});

}

if(i==19)

{

b.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

String ma=text.getText();

dy=Double.parseDouble(ma);

if(what=="add")

{

jg=String.valueOf((tool+dy));

}

if(what=="jq")

{

jg=String.valueOf((tool-dy));

}

if(what=="cs")

{

jg=String.valueOf((tool*dy));

}

if(what=="cq")

{

jg=String.valueOf((tool/dy));

}

if(what==null)

{

if(to=="+")

{

tool=add;

jg=String.valueOf(tool+dy);

}

else if(to=="-")

{

tool=jq;

jg=String.valueOf(dy-tool);

}

else if(to=="*")

{

tool=cs;

jg=String.valueOf(dy*tool);

}

else if(to=="/")

{

tool=cq;

jg=String.valueOf(dy/tool);

}

else

{

jg=String.valueOf(dy);

}

}

text.setText(jg);

Vec.clear();

Vec.add(".");

vc.add("a");

vc1.add("v1");

what=null;

tool=0;

}

});

}

}

}

}

class Centernorth extends JPanel {

public Centernorth() {

final JTextField text=Tool.getinstance().getfield();

JButton jb1=new JButton("Backspace");

JButton jb2=new JButton(" CE ");

JButton jb3=new JButton(" C ");

this.add(jb1);

this.add(jb2);

this.add(jb3);

jb1.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e)

{

String back=Tool.getinstance().getfield().getText();

text.setText(backmethod(back));

Centercenter.Vec.remove(Centercenter.Vec.size()-1);

}

});

jb3.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e)

{

text.setText("0.");

Centercenter.Vec.clear();

Centercenter.Vec.add(".");

Centercenter.vc.add("a");

Centercenter.begin="yes";

Centercenter.vc1.clear();

Centercenter.what=null;

Centercenter.tool=0;

}

});

}

public String backmethod(String str)

{

return str.substring(0,str.length()-1);

}

}

class Centerpanel extends JPanel {

public Centerpanel() {

this.setLayout(new BorderLayout(8,7));

Centernorth cn=new Centernorth();

Centercenter cc=new Centercenter();

Centerwest cw=new Centerwest();

this.add(cn,BorderLayout.NORTH);

this.add(cc,BorderLayout.CENTER);

this.add(cw,BorderLayout.WEST);

}

}

class Centerwest extends JPanel {

public Centerwest() {

this.setLayout(new GridLayout(4,1,3,3));

this.add(new JButton("MC"));

this.add(new JButton("MR"));

this.add(new JButton("MS"));

this.add(new JButton("M+"));

}

}

class Northpanel extends JPanel {

private JTextField tf;

public Northpanel() {

tf=Tool.getinstance().getfield();

this.add(tf);

}

}

---------------------------------------------------------------------------

=============《按你要求特意后改过的最简单功能的代码如下》========================

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import java.util.*;

public class Counter2 {

public static void main(String[] args) {

CounterFrame frame = new CounterFrame();

frame.show();

}

}

class CounterFrame extends JFrame {

public CounterFrame() {

setTitle("计算器");

setSize(new Dimension(400, 280));

this.getContentPane().add(new Allpanel());

this.addWindowListener

(

new WindowAdapter() {

public void windowClosing(WindowEvent e) {

CounterFrame.this.windowClosed();

}

}

);

}

protected void windowClosed() {

System.exit(0);

}

}

class Tool {

public static Tool instance;

private JTextField field;

private Tool() {

this.field=new JTextField(30);

this.field.setHorizontalAlignment(JTextField.RIGHT);

}

public static Tool getinstance()

{

if(instance==null)

{

instance=new Tool();

}

return instance;

}

public JTextField getfield()

{

return (this.field);

}

}

class Allpanel extends JPanel {

public Allpanel() {

this.setLayout(new BorderLayout(0,7));

Northpanel np=new Northpanel();

Centerpanel cp=new Centerpanel();

this.add(np,BorderLayout.NORTH);

this.add(cp,BorderLayout.CENTER);

}

}

class Centercenter extends JPanel {

static Vector Vec=new Vector();

static Vector vc=new Vector();

static Vector vc1=new Vector();

static Vector vc2=new Vector();

static Vector vc3=new Vector();

static String begin="yes";

static double add;

static double jq;

static double cs;

static double cq;

static double dy;

static String jg;

static String what;

static double tool=0;

static String to="yes";

/**

* Method Centercenter

*

*

*/

public Centercenter() {

// TODO: Add your code here

final JTextField text=Tool.getinstance().getfield();

this.setLayout(new GridLayout(4,5,3,3));

String arg[] ={"7","8","9","/","4","5","6","*","1","2","3","-","0","=",".","+"};

for(int i=0;i16;i++)

{

final JButton b=new JButton(arg[i]);

//this.add(new JButton(arg[i]));

this.add(b);

if(i==0||i==1||i==2||i==4||i==5||i==6||i==8||i==9||i==10||i==12)

{

b.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

String mark=b.getText();

String ma=text.getText();

if(vc3.contains("v3"))

{

text.setText("0."+mark);

vc3.clear();

}

else if(vc.contains("a"))

{

if(vc2.contains("v2"))

{

text.setText("0."+mark);

vc.clear();

vc2.clear();

}

else

{

text.setText(mark);

vc.clear();

Vec.clear();

Vec.add(mark);

}

}

else

{

text.setText(ma.trim()+mark);

Vec.add(mark);

}

begin="no";

to="yes";

}

});

}

if(i==14)

{

b.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

String mar=b.getText();

String m=text.getText();

if("yes".equals(begin))

{

vc3.add("v3");

}

if(vc1.contains("v1"))

{

vc2.add("v2");

vc1.clear();

}

if(!Vec.contains(".")!vc.contains("a"))

{

text.setText(m.trim()+mar);

Vec.add(".");

}

}

});

}

if(i==15)

{

b.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

String ma=text.getText();

add=Double.parseDouble(ma);

if(what==null)

{

tool=add;

what="add";

}

else

{

tool=tool+add;

text.setText(String.valueOf((tool)));

}

vc.add("a");

vc1.add("v1");

to="+";

}

});

}

if(i==11)

{

b.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

String ma=text.getText();

jq=Double.parseDouble(ma);

if(what==null)

{

tool=jq;

what="jq";

}

else

{

tool=tool-jq;

text.setText(String.valueOf((tool)));

}

vc.add("a");

vc1.add("v1");

to="-";

}

});

}

if(i==3)

{

b.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

String ma=text.getText();

cq=Double.parseDouble(ma);

if(what==null)

{

tool=cq;

what="cq";

}

else

{

tool=tool/cq;

text.setText(String.valueOf((tool)));

}

vc.add("a");

vc1.add("v1");

to="/";

}

});

}

if(i==7)

{

b.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

String ma=text.getText();

cs=Double.parseDouble(ma);

if(what==null)

{

tool=cs;

what="cs";

}

else

{

tool=tool*cs;

text.setText(String.valueOf((tool)));

}

vc.add("a");

vc1.add("v1");

to="*";

}

});

}

if(i==13)

{

b.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

String ma=text.getText();

dy=Double.parseDouble(ma);

if(what=="add")

{

jg=String.valueOf((tool+dy));

}

if(what=="jq")

{

jg=String.valueOf((tool-dy));

}

if(what=="cs")

{

jg=String.valueOf((tool*dy));

}

if(what=="cq")

{

jg=String.valueOf((tool/dy));

}

if(what==null)

{

if(to=="+")

{

tool=add;

jg=String.valueOf(tool+dy);

}

else if(to=="-")

{

tool=jq;

jg=String.valueOf(dy-tool);

}

else if(to=="*")

{

tool=cs;

jg=String.valueOf(dy*tool);

}

else if(to=="/")

{

tool=cq;

jg=String.valueOf(dy/tool);

}

else

{

jg=String.valueOf(dy);

}

}

text.setText(jg);

Vec.clear();

Vec.add(".");

vc.add("a");

vc1.add("v1");

what=null;

tool=0;

}

});

}

}

}

}

class Centernorth extends JPanel {

public Centernorth() {

final JTextField text=Tool.getinstance().getfield();

}

}

class Centerpanel extends JPanel {

public Centerpanel() {

this.setLayout(new BorderLayout(8,7));

Centernorth cn=new Centernorth();

Centercenter cc=new Centercenter();

Centerwest cw=new Centerwest();

this.add(cn,BorderLayout.NORTH);

this.add(cc,BorderLayout.CENTER);

this.add(cw,BorderLayout.WEST);

}

}

class Centerwest extends JPanel {

public Centerwest() {

}

}

class Northpanel extends JPanel {

private JTextField tf;

public Northpanel() {

tf=Tool.getinstance().getfield();

this.add(tf);

}

}

------------------------------------------------------------

才子_辉祝您愉快！

用JAVA编写一个简单的计算器，要求如下:

然后 通过输入 显示结果，比如说：

以下是上图计算器的代码:

package Computer;

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.Container;

import java.awt.Font;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.util.Stack;

import javax.swing.JApplet;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JTextField;

public class Count extends JApplet implements ActionListener

{

/**

*

*/

private static final long serialVersionUID = 1L;

private JTextField textField = new JTextField("请输入");

String operator = "";//操作

String input = "";//输入的 式子

boolean flag =  true;

//  boolean flag1 = true;

//  boolean flag2 = true;

public void init()//覆写Applet里边的init方法

{

Container C = getContentPane();

JButton b[] = new JButton[16];

JPanel panel = new JPanel();

C.add(textField, BorderLayout.NORTH);

C.add(panel,BorderLayout.CENTER);

panel.setLayout(new GridLayout(4, 4,5,5));

String name[]={"7","8","9","+","4","5","6","-","1","2","3","*","0","C","=","/"};//设置 按钮

for(int i=0;i16;i++)//添加按钮

{

b[i] = new JButton(name[i]);

b[i].setBackground(new Color(192,192,192));

b[i].setForeground(Color.BLUE);//数字键 设置为 蓝颜色

if(i%4==3)

b[i].setForeground(Color.RED);

b[i].setFont(new Font("宋体",Font.PLAIN,16));//设置字体格式

panel.add(b[i]);

b[i].addActionListener(this);

}

b[13].setForeground(Color.RED);//非数字键，即运算键设置为红颜色

b[13].setForeground(Color.RED);

}

public void actionPerformed(ActionEvent e)

{

int cnt = 0;

String actionCommand = e.getActionCommand();

if(actionCommand.equals("+")||actionCommand.equals("-")||actionCommand.equals("*") ||actionCommand.equals("/"))

input +=" "+actionCommand+" ";//设置输入，把输入的样式改成 需要的样子

else if(actionCommand.equals("C"))

input = "";

else if(actionCommand.equals("="))//当监听到等号时，则处理 input

{

input+= "="+compute(input);

textField.setText(input);

input="";

cnt = 1;

}

else

input += actionCommand;//数字为了避免多位数的输入 不需要加空格

if(cnt==0)

textField.setText(input);

}

private String compute(String input)//即1237 的 样例

{

String str[];

str = input.split(" ");

StackDouble s = new StackDouble();

double m = Double.parseDouble(str[0]);

s.push(m);

for(int i=1;istr.length;i++)

{

if(i%2==1)

{

if(str[i]点抗 pareTo("+")==0)

{

double help = Double.parseDouble(str[i+1]);

s.push(help);

}

if(str[i]点抗 pareTo("-")==0)

{

double help = Double.parseDouble(str[i+1]);

s.push(-help);

}

if(str[i]点抗 pareTo("*")==0)

{

double help = Double.parseDouble(str[i+1]);

double ans = s.peek();//取出栈顶元素

s.pop();//消栈

ans*=help;

s.push(ans);

}

if(str[i]点抗 pareTo("/")==0)

{

double help = Double.parseDouble(str[i+1]);

double ans = s.peek();

s.pop();

ans/=help;

s.push(ans);

}

}

}

double ans = 0d;

while(!s.isEmpty())

{

ans+=s.peek();

s.pop();

}

String result = String.valueOf(ans);

return result;

}

public static void main(String args[])

{

JFrame frame = new JFrame("Count");

Count applet = new Count();

frame.getContentPane().add(applet, BorderLayout.CENTER);

applet.init();//applet的init方法

applet.start();//线程开始

frame.setSize(350, 400);//设置窗口大小

frame.setVisible(true);//设置窗口可见

}

}

求JAVA简易计算器代码。

import javax.swing.SwingUtilities;

import javax.swing.JPanel;

import javax.swing.JFrame;

import javax.swing.JTextField;

import java.awt.Rectangle;

import javax.swing.JButton;

public class Calculator extends JFrame {

private static final long serialVersionUID = 1L;

private JPanel jContentPane = null;

private JTextField jTextField = null;

private JButton jButton = null;

private JButton jButton1 = null;

private JButton jButton2 = null;

private JButton jButton3 = null;

private JButton jButton4 = null;

private JButton jButton5 = null;

private JButton jButton6 = null;

private JButton jButton7 = null;

private JButton jButton8 = null;

private JButton jButton9 = null;

private JButton jButton10 = null;

private JButton jButton11 = null;

private JButton jButton12 = null;

private JButton jButton13 = null;

private JButton jButton14 = null;

private double first = 0;

private double second = 0;

private JButton jButton15 = null;

private JButton jButton16 = null;

private String way = "";

private double result = 0;

private char[] ch = new char[12];

private int i = 0;

/**

* This method initializes jTextField

*

* @return javax.swing.JTextField

*/

private JTextField getJTextField() {

if (jTextField == null) {

jTextField = new JTextField("0");

jTextField.setBounds(new Rectangle(60, 15, 234, 31));

jTextField.setHorizontalAlignment(JTextField.RIGHT);

}

return jTextField;

}

/**

* This method initializes jButton

*

* @return javax.swing.JButton

*/

private JButton getJButton() {

if (jButton == null) {

jButton = new JButton();

jButton.setBounds(new Rectangle(62, 74, 44, 37));

jButton.setText("1");

jButton.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

ch[i] = '1';

jTextField.setText(new String(ch).trim());

i++;

}

});

}

return jButton;

}

/**

* This method initializes jButton1

*

* @return javax.swing.JButton

*/

private JButton getJButton1() {

if (jButton1 == null) {

jButton1 = new JButton();

jButton1.setBounds(new Rectangle(119, 74, 44, 37));

jButton1.setText("2");

jButton1.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

ch[i] = '2';

jTextField.setText(new String(ch).trim());

i++;

}

});

}

return jButton1;

}

/**

* This method initializes jButton2

*

* @return javax.swing.JButton

*/

private JButton getJButton2() {

if (jButton2 == null) {

jButton2 = new JButton();

jButton2.setBounds(new Rectangle(176, 74, 44, 37));

jButton2.setText("3");

jButton2.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

ch[i] = '3';

jTextField.setText(new String(ch).trim());

i++;

}

});

}

return jButton2;

}

/**

* This method initializes jButton3

*

* @return javax.swing.JButton

*/

private JButton getJButton3() {

if (jButton3 == null) {

jButton3 = new JButton();

jButton3.setBounds(new Rectangle(62, 129, 44, 37));

jButton3.setText("4");

jButton3.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

ch[i] = '4';

jTextField.setText(new String(ch).trim());

i++;

}

});

}

return jButton3;

}

/**

* This method initializes jButton4

*

* @return javax.swing.JButton

*/

private JButton getJButton4() {

if (jButton4 == null) {

jButton4 = new JButton();

jButton4.setBounds(new Rectangle(119, 129, 44, 37));

jButton4.setText("5");

jButton4.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

ch[i] = '5';

jTextField.setText(new String(ch).trim());

i++;

}

});

}

return jButton4;

}

/**

* This method initializes jButton5

*

* @return javax.swing.JButton

*/

private JButton getJButton5() {

if (jButton5 == null) {

jButton5 = new JButton();

jButton5.setBounds(new Rectangle(176, 129, 44, 37));

jButton5.setText("6");

jButton5.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

ch[i] = '6';

jTextField.setText(new String(ch).trim());

i++;

}

});

}

return jButton5;

}

/**

* This method initializes jButton6

*

* @return javax.swing.JButton

*/

private JButton getJButton6() {

if (jButton6 == null) {

jButton6 = new JButton();

jButton6.setBounds(new Rectangle(62, 184, 44, 37));

jButton6.setText("7");

jButton6.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

ch[i] = '7';

jTextField.setText(new String(ch).trim());

i++;

}

});

}

return jButton6;

}

/**

* This method initializes jButton7

*

* @return javax.swing.JButton

*/

private JButton getJButton7() {

if (jButton7 == null) {

jButton7 = new JButton();

jButton7.setBounds(new Rectangle(119, 184, 44, 37));

jButton7.setText("8");

jButton7.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

ch[i] = '8';

jTextField.setText(new String(ch).trim());

i++;

}

});

}

return jButton7;

}

/**

* This method initializes jButton8

*

* @return javax.swing.JButton

*/

private JButton getJButton8() {

if (jButton8 == null) {

jButton8 = new JButton();

jButton8.setBounds(new Rectangle(176, 184, 44, 37));

jButton8.setText("9");

jButton8.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

ch[i] = '9';

jTextField.setText(new String(ch).trim());

i++;

}

});

}

return jButton8;

}

/**

* This method initializes jButton9

*

* @return javax.swing.JButton

*/

private JButton getJButton9() {

if (jButton9 == null) {

jButton9 = new JButton();

jButton9.setBounds(new Rectangle(233, 74, 44, 37));

jButton9.setText("+");

jButton9.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

first = Double.parseDouble(jTextField.getText());

way = "+";

ch = new char[12];

i = 0;

jButton16.setEnabled(true);

}

});

}

return jButton9;

}

/**

* This method initializes jButton10

*

* @return javax.swing.JButton

*/

private JButton getJButton10() {

if (jButton10 == null) {

jButton10 = new JButton();

jButton10.setBounds(new Rectangle(290, 74, 44, 37));

jButton10.setText("-");

jButton10.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

first = Double.parseDouble(jTextField.getText());

way = "-";

ch = new char[12];

i = 0;

jButton16.setEnabled(true);

}

});

}

return jButton10;

}

/**

* This method initializes jButton11

*

* @return javax.swing.JButton

*/

private JButton getJButton11() {

if (jButton11 == null) {

jButton11 = new JButton();

jButton11.setBounds(new Rectangle(233, 129, 44, 37));

jButton11.setText("*");

jButton11.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

first = Double.parseDouble(jTextField.getText());

way = "*";

ch = new char[12];

i = 0;

jButton16.setEnabled(true);

}

});

}

return jButton11;

}

/**

* This method initializes jButton12

*

* @return javax.swing.JButton

*/

private JButton getJButton12() {

if (jButton12 == null) {

jButton12 = new JButton();

jButton12.setBounds(new Rectangle(290, 129, 44, 37));

jButton12.setText("/");

jButton12.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

first = Double.parseDouble(jTextField.getText());

way = "/";

ch = new char[12];

i = 0;

jButton16.setEnabled(true);

}

});

}

return jButton12;

}

/**

* This method initializes jButton13

*

* @return javax.swing.JButton

*/

private JButton getJButton13() {

if (jButton13 == null) {

jButton13 = new JButton();

jButton13.setBounds(new Rectangle(233, 184, 44, 37));

jButton13.setText("=");

jButton13.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

second = Double.parseDouble(jTextField.getText());

if (way.equals("")){

jTextField.setText(""+second);

}

if (way.equals("+")){

result = first + second;

jTextField.setText(""+result);

}

if (way.equals("-")){

result = first - second;

jTextField.setText(""+result);

}

if (way.equals("*")){

result = first * second;

jTextField.setText(""+result);

}

if(way.equals("/")){

if (second != 0){

result = first / second;

jTextField.setText(""+result);

}else{

jTextField.setText("error");

}

}

jButton16.setEnabled(true);

}

});

}

return jButton13;

}

/**

* This method initializes jButton14

*

* @return javax.swing.JButton

*/

private JButton getJButton14() {

if (jButton14 == null) {

jButton14 = new JButton();

jButton14.setBounds(new Rectangle(290, 184, 44, 37));

jButton14.setText("C");

jButton14.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

jTextField.setText("0");

first = 0;

second = 0;

way = "";

ch = new char[12];

i = 0;

jButton16.setEnabled(true);

}

});

}

return jButton14;

}

/**

* This method initializes jButton15

*

* @return javax.swing.JButton

*/

private JButton getJButton15() {

if (jButton15 == null) {

jButton15 = new JButton();

jButton15.setBounds(new Rectangle(62, 231, 102, 26));

jButton15.setText("0");

jButton15.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

ch[i] = '0';

jTextField.setText(new String(ch).trim());

i++;

}

});

}

return jButton15;

}

/**

* This method initializes jButton16

*

* @return javax.swing.JButton

*/

private JButton getJButton16() {

if (jButton16 == null) {

jButton16 = new JButton();

jButton16.setBounds(new Rectangle(176, 231, 44, 26));

jButton16.setText(".");

jButton16.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

if(ch[0] == 0){

ch[i] = '0';

ch[i+1] = '.';

i++;

}else{

ch[i] = '.';

}

jTextField.setText(new String(ch).trim());

i++;

jButton16.setEnabled(false);

}

});

}

return jButton16;

}

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

SwingUtilities.invokeLater(new Runnable() {

public void run() {

Calculator thisClass = new Calculator();

thisClass.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

thisClass.setVisible(true);

}

});

}

/**

* This is the default constructor

*/

public Calculator() {

super();

initialize();

}

/**

* This method initializes this

*

* @return void

*/

private void initialize() {

this.setSize(356, 298);

this.setContentPane(getJContentPane());

this.setTitle("计算器");

this.setResizable(false);

}

/**

* This method initializes jContentPane

*

* @return javax.swing.JPanel

*/

private JPanel getJContentPane() {

if (jContentPane == null) {

jContentPane = new JPanel();

jContentPane.setLayout(null);

jContentPane.add(getJTextField(), null);

jContentPane.add(getJButton(), null);

jContentPane.add(getJButton1(), null);

jContentPane.add(getJButton2(), null);

jContentPane.add(getJButton3(), null);

jContentPane.add(getJButton4(), null);

jContentPane.add(getJButton5(), null);

jContentPane.add(getJButton6(), null);

jContentPane.add(getJButton7(), null);

jContentPane.add(getJButton8(), null);

jContentPane.add(getJButton9(), null);

jContentPane.add(getJButton10(), null);

jContentPane.add(getJButton11(), null);

jContentPane.add(getJButton12(), null);

jContentPane.add(getJButton13(), null);

jContentPane.add(getJButton14(), null);

jContentPane.add(getJButton15(), null);

jContentPane.add(getJButton16(), null);

}

return jContentPane;

}

} // @jve:decl-index=0:visual-constraint="437,27"

哥们！这是用eclipse中的visual editor做的，所以代码比较多，复制粘贴不方便，我可以发你邮箱。你把代码打上去，一样能运行的！！！

如何用JAVA语言编写计算器小程序？

具体代码如下：

import javax.swing.*;

import java.awt.event.*;

import java.awt.*;

public class Calculator  extends JFrame implements ActionListener  {

private JFrame jf;

private JButton[] allButtons;

private JButton clearButton;

private JTextField jtf;

public Calculator() {

//对图形组件实例化

jf=new JFrame("任静的计算器1.0：JAVA版");

jf.addWindowListener(new WindowAdapter(){

public void windowClosing(){

System.exit(0);

}

});

allButtons=new JButton[16];

clearButton=new JButton("清除");

jtf=new JTextField(25);

jtf.setEditable(false);

String str="123+456-789*0.=/";

for(int i=0;iallButtons.length;i++){

allButtons[i]=new JButton(str.substring(i,i+1));

}

}

public void init(){

//完成布局

jf.setLayout(new BorderLayout());

JPanel northPanel=new JPanel();

JPanel centerPanel=new JPanel();

JPanel southPanel=new JPanel();

northPanel.setLayout(new FlowLayout());

centerPanel.setLayout(new GridLayout(4,4));

southPanel.setLayout(new FlowLayout());

northPanel.add(jtf);

for(int i=0;i16;i++){

centerPanel.add(allButtons[i]);

}

southPanel.add(clearButton);

jf.add(northPanel,BorderLayout.NORTH);

jf.add(centerPanel,BorderLayout.CENTER);

jf.add(southPanel,BorderLayout.SOUTH);

addEventHandler();

}

//添加事件监听

public void addEventHandler(){

jtf.addActionListener(this);

for(int i=0;iallButtons.length;i++){

allButtons[i].addActionListener(this);

}

clearButton.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

Calculator.this.jtf.setText("");

}

});

}

//事件处理

public void actionPerformed(ActionEvent e) {

//在这里完成事件处理  使计算器可以运行

String action=e.getActionCommand();

if(action=="+"||action=="-"||action=="*"||action=="/"){

}

}

public void setFontAndColor(){

Font f=new Font("宋体",Font.BOLD,24);

jtf.setFont(f);

jtf.setBackground(new Color(0x8f,0xa0,0xfb));

for(int i=0;i16;i++){

allButtons[i].setFont(f);

allButtons[i].setForeground(Color.RED);

}

}

public void showMe(){

init();

setFontAndColor();

jf.pack();

jf.setVisible(true);

jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public static void main(String[] args){

new Calculator().showMe();

}

}